摘要
采用Bacillus subtilis NX-2菌株,在5 L发酵罐批式操作过程中生物合成γ-聚谷氨酸,实验考察了搅拌转速(300~1 000r/min)及底物质量浓度对生物合成γ-聚谷氨酸产率的影响.结果表明:转速为400r/min时,γ-聚谷氨酸产率最高,可高达21.78g/L.在转速400r/min的条件下,考察了葡萄糖和谷氨酸浓度对聚谷氨酸生物合成的影响,根据葡萄糖初始质量浓度为40g/L的实验数据建立了动力学方程.并在葡萄糖初始质量浓度为30,40,50,60g/L的范围内,验证所建动力学方程的稳定性和实用性.结果表明,在以上葡萄糖初始质量浓度范围内,所建模型对B.subtilis NX-2批式生物合成γ-聚谷氨酸产率的预测值与实验值能较好的吻合.
The effects of agitation speed and substrate on γ-Poly(glutamic acid) (γ-PGA) Production of Bacillus subtilis NX-2 in 5 L fermenter were investigated. The results indicated that the highest yield of γ-PGA could obtained 21.78 g/L with 400 r/min. Based on experimental data of initial glucose concentration 40 g/L at 400 r/min, the kinetic equations of substrate for γ-PC, A biosynthesis was established. With the initial glucose concentration from 30 to 60 g/L, the proposed kinetic models were to be proved and the results showed that the theoretical predicted data of γ-PGA production by Bacillus subtilis NX-2 fitted the experimental data pretty well.
出处
《生物加工过程》
CAS
CSCD
2006年第1期65-69,共5页
Chinese Journal of Bioprocess Engineering
基金
国家"863"计划资助项目(编号:2002AA327020)
江苏省高技术基金资助项目(编号:BG2001043)
关键词
聚谷氨酸
搅拌转速
动力学
分批发酵
poly(glutamic acid)
agitation speed
kinetic
biosynthesis